What is the difference between an Outcome (which, per comments in /pytest/src/_pytest/reports.py, can only be one of Pass/Fail/Skip), and a result (which could be any of those, PLUS XF, XP, Err, Warn, or even Rerun or possibly something else if a plugin is installed)?
There are multiple third-part plugins that don't get the same tallies as the console stats: pytest-html, pytest-json, pytest-tui. Their tallies don't agree with what Pytest itself claims on the final `=== short test summary info ===` line in the console at the end of a test run. And if anything shoul be correct, it's that, right? To wit:
  console: 17 failed, 19 passed, 5 skipped, 7 xfailed, 4 xpassed, 21 warnings, 9 errors
  pytest-html: 17 failed, 17 passed, 5 skipped, 7 xfailed, 4 xpassed, 8 errors ()
  pytest-json: 16 failed, 17 passed, 5 skipped, 7 xfailed, 4 xpassed, 9 errors (57)
  pytest-tui: 16 failed, 17 passed, 5 skipped, 7 xfailed, 4 xpassed, 9 errors
Discrepancies:
  pytest-tui misses FAILED:
    test_issue_1004.py::test_foo3  <= https://github.com/pytest-dev/pytest/issues/1004
  pytest-tui misses PASSED:
    test_hoefling.py::test_4
Confusion on this is not just mine:
  https://stackoverflow.com/questions/51711988/how-can-i-access-the-overall-test-result-of-a-pytest-test-run-during-runtime
  ...
Acoording to outcomes.py, an outcome could be Xfail? Or at least it has a class dedicated to it just as do Fail and Skipped? And where is the class for Pass?
